Chair and tray thereof

Abstract

The utility model discloses a chair and tray, including the base that is used for installing the support leg, be used for installing the footstock of chair seat and be used for installing the tailstock of chair back, connecting rod include first connecting rod and second connecting rod, the first connecting rod is located the front side of second connecting rod, the bottom of first connecting rod is articulated with the base through the first shaft, and the second connecting rod is articulated with the base through the second shaft. The top of the first connecting rod is hinged to the top seat through a second shaft, the bottom of the second connecting rod is hinged to the base through a third shaft, the top of the second connecting rod is hinged to the top seat through a fifth shaft, the middle of the second connecting rod is in sliding fit with the rear portion of the tailstock through a fourth shaft, and the front portion of the tailstock is hinged to the base through a first shaft. And an elastic component for endowing the tailstock with an upward swinging trend is arranged between the base and the tailstock. By means of the arrangement, the tray is simpler in structure, supporting of the tailstock is softer, and the user experience is better.

Description

Technical Field

[0001] The utility model relates to the field of home furnishings, in particular to a chair and a tray thereof. Background Art

[0002] Chairs have become a necessary household item in people's daily lives, and most chairs have the function of adjusting the backrest angle. The chair tray is an important connection and control component and is particularly important. The important adjustment functions of the chair are all set in the tray.

[0003] The prior art with publication number CN112674516A discloses a chair and its chair tray including a base for connecting chair legs, a tailstock for installing a chair back and a top seat for installing a seat cushion, the top seat including left and right side walls extending downwardly, the tailstock being hinged to the rear portion of the base through a tailstock rotating shaft, the tailstock rotating shaft passing through the base, the tailstock being hinged to the rear portion of the left and right side walls of the top seat through a linkage shaft, the linkage shaft passing through the base and the tailstock and the linkage shaft passing through an arc hole set on the base, the linkage shaft being located below the tailstock rotating shaft, the front portion of the top seat being slidably connected to the front portion of the base through a limit shaft, the limit shaft passing through the base, and limit sliding holes being provided on the left and right side walls of the top seat, the limit shaft passing through the limit sliding holes and the two slidingly fitting; a reset compression spring is connected between the limit shaft and the linkage shaft; the reset action is performed by the reset compression spring having a guiding property.

[0004] In the prior art, the tailstock movement utilizes the rotating shaft between the tailstock and the base as a fulcrum to pry the top seat to move; this method causes the top seat and the tailstock to move synchronously, and all the pressure is concentrated on the rotating shaft, which not only leads to greater pressure on the rotating shaft, but also makes the connection structure with the pallet more complicated. Utility Model Content

[0005] In order to solve the problems in the prior art, the purpose of the present invention is to provide a chair and a tray thereof, wherein the structure of the tray is simpler, the support of the tailstock is softer, and the user experience is better.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a tray, including a base for installing support legs, a top seat for installing a chair seat and a tail seat for installing a chair back, the connecting rod includes a first connecting rod and a second connecting rod, the first connecting rod is located in front of the second connecting rod, the bottom of the first connecting rod is hinged to the base through a first axis, the top of the first connecting rod is hinged to the top seat through a second axis, the bottom of the second connecting rod is hinged to the base through a third axis, the top of the second connecting rod is hinged to the top seat through a fifth axis, the middle position of the second connecting rod is slidably matched with the rear part of the tail seat through a fourth axis, and the front part of the tail seat is hinged to the base through the first axis; an elastic component for giving the tail seat an upward swinging tendency is provided between the base and the tail stock.

[0007] Preferably, the two first connecting rods are symmetrically arranged on the left and right, and the two second connecting rods are symmetrically arranged on the left and right and fixedly connected by a reinforcing plate.

[0008] Preferably, a limit seat is fixed on the tailstock, and a first slide groove is provided on the limit seat. The first slide groove is arranged upward from front to rear, and the fourth shaft is installed on the second connecting rod. The fourth shaft passes through the first slide groove and slides with the first slide groove.

[0009] Preferably, the tailstock includes a front plate, a rear plate and two side plates, the front plate and the rear plate are respectively arranged at the front and rear of the side plates, and the front plate and the rear plate are fixedly connected to the side plates; a limit plate is fixed on the base, and the limit plate is located on the rear side of the front plate; the elastic component is arranged between the front plate and the limit plate.

[0010] Preferably, the elastic component includes a first spring, and two ends of the first spring act on the front plate and the limiting plate respectively.

[0011] Preferably, the two groups of elastic members are symmetrically arranged between the front plate and the limiting plate.

[0012] Preferably, the elastic component further comprises a synchronization shaft, on which two rollers are rotatably mounted; the front portion of the first spring abuts against the synchronization shaft, causing the rollers to abut against the front plate.

[0013] Preferably, the cam is rotatably mounted on the front plate, a plurality of gear slots are provided on the outer peripheral surface of the cam, and the synchronizing shaft is engaged with the gear slots.

[0014] Preferably, a first locking tongue is slidably mounted on the base, one end of the first locking tongue can extend from the base, and the first locking tongue is pluggably connected to the locking hole on the tailstock.

[0015] A chair comprising the above-mentioned tray.

[0016] The beneficial effects of the technical solution of the present invention are as follows: in the above solution, the connection structure of the tray is simpler, and the tailstock in the above solution rotates with the fifth axis as the fulcrum, which results in that when the tailstock rotates, the elastic component will preferably give feedback to the tailstock, and then when the pressure received by the fifth axis is greater than the thrust of the top seat given by the elastic component, the fifth axis will drive the moving connecting rod to drive the top seat to move, and the elastic feedback received by the tailstock during the tilting process of the tailstock is soft and the support is stable; part of the force of the tailstock is directly fed back to the base, and the other part is fed back to the second connecting rod; the structure of the above tray is simpler, the support of the tailstock is softer, and the user experience is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the pallet when the rear part of the tailstock is tilted downward;

[0018] Figure 2 This is a schematic diagram of the structure of the pallet when the tailstock is in a horizontal state;

[0019] Figure 3 This is a schematic diagram of the structure of the pallet when the rear part of the tailstock is tilted upward;

[0020] Figure 4 Schematic diagram of the connection structure between the seat plate and the top seat;

[0021] Figure 5 It is a structural diagram of the top seat and the lock tongue;

[0022] Figure 6 is a schematic diagram of the connection structure between the third spring and the second lock tongue;

[0023] Figure 7 Schematic diagram of the structure of the top seat;

[0024] Figure 8 Schematic diagram of the structure of the seat plate;

[0025] Figure 9 The structure of the pallet after removing the seat plate Figure 1 ;

[0026] Figure 10 The structure of the pallet after removing the seat plate Figure 2 ;

[0027] Figure 11 The structure of the pallet after removing the seat plate Figure 3 ;

[0028] Figure 12 Schematic diagram of the structure of the tray after removing the seat plate, top seat and elastic component;

[0029] Figure 13 It is the structural diagram of the tailstock;

[0030] Figure 14 Schematic diagram of the locking mechanism Figure 1 ;

[0031] Figure 15 Schematic diagram of the locking mechanism Figure 2 ;

[0032] Figure 16 Schematic diagram of the lever structure Figure 1 ;

[0033] Figure 17 Schematic diagram of the lever structure Figure 2 ;

[0034] Figure 18 Schematic diagram of the connection structure of the gas rod, rocker arm and base;

[0035] Figure 19 is a schematic diagram of the connection structure of the second cable, the rocker arm and the second mounting seat;

[0036] Figure 20 is a structural diagram of the pendulum;

[0037] Figure 21 Schematic diagram of the structure of the second mounting base Figure 1 ;

[0038] Figure 22 Schematic diagram of the structure of the second mounting base Figure 2 ;

[0039] Figure 23 This is a schematic diagram of the pallet structure after removing the outer panels of the base plate, top seat and tail seat;

[0040] Figure 24 Schematic diagram of the elastic component structure Figure 1 ;

[0041] Figure 25 Schematic diagram of the elastic component structure Figure 2 ;

[0042] Figure 26 Schematic diagram of the structure of the adjustment part Figure 1 ;

[0043] Figure 27 Schematic diagram of the structure of the adjustment part Figure 2 .

[0044] Reference numerals: 1, top seat; 111, sixth limiting portion; 112, sixth positioning groove; 113, seventh positioning groove; 114, second avoidance groove; 115, seventh positioning groove; 12, seat plate; 121, waist-shaped sliding hole; 122, second through hole; 123, plug-in portion; 124, second latching protrusion; 125, first through hole; 13, second locking tongue; 131, locking end; 132, slot; 133, fourth avoidance hole; 14, third cable; 15, cover; 16, third spring; 17, pressure cover;

[0045] 2. Base; 24. Limit plate; 25. Positioning plate;

[0046] 3. Tailstock; 31. Side panel; 32. Rear panel; 33. Front panel; 34. Locking plate; 341. Locking hole; 35. Limit seat; 351. First slideway; 36. Exterior panel;

[0047] 4, second connecting rod; 41, third shaft; 42, fourth shaft; 43, fifth shaft;

[0048] 5. First connecting rod; 51. First shaft; 52. Second shaft;

[0049] 61. First spring; 62. First mounting seat; 63. First gear; 64. Second gear; 65. Transmission block; 651. External gear; 66. Cam; 661. Shift slot; 662. Second stopper; 67. Synchronizing shaft; 68. Roller; 69. Drive rod; 60. Handle;

[0050] 71. Second mounting seat; 711. Second positioning slot; 712. First positioning slot; 713. Positioning portion; 714. Third limiting slot; 715. First limiting slot; 716. Fourth limiting portion; 717. Fourth limiting slot; 718. Third positioning slot; 719. Fourth positioning slot; 710. Fifth positioning slot; 7101. Connecting hole; 72. Deflector lever; 721. Second connecting portion; 722. Fifth limiting portion; 723. Driving slot; 724. Third limiting portion; 725. Second limiting slot; 73. First locking tongue; 74. First cable; 76. Second spring; 77. Connecting cap; 78. First torsion spring;

[0051] 8. Gas rod; 81. Second cable; 82. Rocker arm; 821. Operating end; 822. Accommodation groove; 83. Connecting sleeve; 80. Switch. DETAILED DESCRIPTION

[0052] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0055] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0056] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature. Example

[0057] like Figures 1 to 27 The chair tray shown includes a base 2 for installing support legs, a top seat 1 for installing a chair seat and a tail seat 3 for installing a chair back. The base 2, top seat 1 and tail seat 3 are connected by a connecting rod. When the tail seat 3 moves, the top seat 1 can be driven to move synchronously by the connecting rod; a tail seat locking mechanism is provided between the base 2 and the tail seat 3, and the movement state of the locking mechanism includes a locked state and an unlocked state. When the locking mechanism is in the locked state, the base 2 and the tail seat 3 are relatively fixed; when the locking mechanism is in the unlocked state, the tail seat 3 can swing freely relative to the base 2; an elastic reset mechanism capable of adjusting the reset force is provided between the base 2 and the tail seat 3; when the locking mechanism is in the unlocked state, the reset mechanism can drive the tail seat 3 to reset itself; a control mechanism for controlling the gas rod is also provided on the base 2; the chair seat can be installed on the top seat 1 through the seat plate 12 in a manner that can slide back and forth.

[0058] With this arrangement, the chair can be raised and lowered, the backrest can be tilted, the seat can be moved forward and backward, and the reset force can be controlled through the tray. This allows the chair tray to have more functions and thus be able to adapt to more users.

[0059] In this embodiment, Figures 10 to 12As shown, the connecting rod includes a first connecting rod 5 and a second connecting rod 4. The first connecting rod 5 is located in front of the second connecting rod 4. The bottom of the first connecting rod 5 is hinged to the base 2 through the first axis 51, and the top of the first connecting rod 5 is hinged to the top seat 1 through the second axis 52. The bottom of the second connecting rod 4 is hinged to the base 2 through the third axis 41, and the top of the second connecting rod 4 is hinged to the top seat 1 through the fifth axis 43. The middle position of the second connecting rod 4 is slidably matched with the rear end of the tail stock 3 through the fourth axis 42, and the front end of the tail stock 3 is hinged to the base 2 through the first axis 51. With this arrangement, the base, top seat, tailstock, first link and second link form a multi-link structure, thereby ensuring the overall connection strength of the pallet; secondly, the tailstock rotates with the fifth axis as the fulcrum, which results in the elastic component giving feedback to the tailstock preferentially when the tailstock rotates, and then when the pressure received by the fifth axis is greater than the thrust given to the top seat by the elastic component, the fifth axis will drive the moving link to drive the top seat to move, which also results in the tailstock force being gentle and stable when supported, and the process of tilting the tailstock is from easy to difficult.

[0060] Further preferably, the two first connecting rods 5 are arranged symmetrically on the left and right, the two second connecting rods 4 are arranged symmetrically on the left and right, and the two second connecting rods 4 are fixedly connected by a reinforcing plate 44 .

[0061] Further preferably, a limit seat 35 is fixed on the tailstock 3, and a first inclined slide groove 351 is provided on the limit seat 35. One end of the fourth shaft 42 is fixedly connected to the second connecting rod 4, and the fourth shaft 42 passes through the first slide groove 351 and slides with the first slide groove 351.

[0062] Further preferably, the tailstock 3 includes two side plates 31 , and the two side plates 31 are fixedly connected via an end plate; the limiting seat 35 is embedded in the side plates 31 .

[0063] Preferably, the side panels 31 are covered with an exterior panel 36. The exterior panel 36 includes a left stopper and a right stopper, the rear ends of which are fixed via a first connecting portion. The two side panels 31 are respectively embedded in the left and right stoppers. This arrangement enhances the appearance of the tray.

[0064] In this embodiment, Figures 23 to 25 As shown, the reset mechanism includes an elastic component for driving the tailstock 3 to reset and an adjusting component for adjusting the elastic force of the elastic component. The tailstock 3 is hinged to the base 2, and the two ends of the elastic component are respectively against the base 2 and the tailstock 3;

[0065] The adjusting assembly is arranged between the elastic assembly and the tailstock 3; the adjusting seat assembly includes a cam 66 and a first mounting seat 62, the first mounting seat 62 is fixed on the tailstock 3, and the cam 66 is rotatably mounted on the first mounting seat 62. The cam 66 can counteract the elastic assembly, and when the cam 66 rotates, it can push the elastic assembly to change the elastic force of the elastic assembly.

[0066] With this arrangement, the restoring force of the chair can be freely adjusted, thereby enabling the chair to adapt to users with different needs.

[0067] In this embodiment, Figures 9 to 13 As shown, the end plate of the tailstock 3 includes a front end plate 33 and a rear end plate 32, which are respectively arranged at the front end and rear end of the side plate 31, and the front end plate 33 and the rear end plate 32 are both fixedly connected to the side plate 31; the first mounting seat 62 is fixedly connected to the front end plate 33 of the tailstock 3, and the two ends of the elastic component are respectively abutted against the front end plate 33 of the tailstock 3 and the rear end of the base 2. The left and right ends of the base are bent to form side blocks, which are located between the two side plates. The first connecting rod 5, the second connecting rod 4 and the elastic component are all located between the two side blocks. The two first connecting rods 5 are symmetrically arranged on the left and right sides, and the two second connecting rods 4 are symmetrically arranged on the left and right sides.

[0068] In this embodiment, the first mounting seat 62 is hinged to the base 2 , and the first mounting seat 62 is fixedly connected to the front end plate 33 of the tail stock 3 .

[0069] In this embodiment, Figures 23 to 27 As shown, the adjustment assembly includes a first gear 63, a second gear 64, and a transmission block 65. The first gear 63 is fixed to the drive rod 69, and the second gear 64 is rotatably mounted on the first mounting base 62 via the sixth shaft 641. The first gear 63 and the second gear 64 are meshed and transmitted. The cam 66 is rotatably mounted on the first mounting base 62 via the seventh shaft. The transmission block 65 is mounted on the third shaft 41. The transmission block 65 and the cam 66 are fixedly connected by a positioning pin. The transmission block 65 has a protruding external tooth 651, and the transmission block 65 meshes and transmits power via the external tooth 651 with the second gear 64. In this arrangement, the first gear, the second gear, and the transmission block can form a reduction mechanism, thereby enabling detailed adjustment of the cam rotation.

[0070] Further preferably, the driving rod 69 is coaxially arranged with the first shaft 51 , and the first mounting seat 62 is hinged to the base via the driving rod.

[0071] In this embodiment, the elastic component includes an elastic member and a synchronous member. The synchronous member includes a synchronous shaft 67, on which two rollers 68 are rotatably mounted. The front end of the elastic member abuts against the synchronous shaft 67, and the rear end of the elastic member abuts against the rear end of the base 2.

[0072] Furthermore, the front end of the elastic member is provided with a first avoidance groove and two first clamping grooves, the first avoidance groove is located between the two first clamping grooves and are interconnected, and the rear end of the elastic member is provided with an arc-shaped second clamping groove; the rear end of the base 2 is fixed with a limiting plate 24, the limiting plate 24 is located on the rear side of the front end plate 33, and the top of the limiting plate 24 is provided with an arc-shaped first clamping protrusion; the limiting plate 24 and the positioning plate 25 are integrally formed.

[0073] The rear end of the elastic member is buckled on the first latching protrusion of the positioning plate 25 through the second latching slot, so that the elastic member can rotate relative to the base 2; the first latching slot at the front end of the elastic member buckles the synchronization shaft 67, and the roller 68 on the synchronization shaft 67 is inserted into the slot at the front end of the elastic member. Part of the roller 68 protrudes from the slot, and the elastic member can push the roller 68 so that the roller 68 is against the front end plate 33 of the tailstock 3; the cam 66 is against the synchronization shaft 67.

[0074] In this embodiment, Figures 23 to 27 As shown, there are two groups of elastic members, two rollers 68 are provided on the synchronization shaft 67, the two groups of elastic members are symmetrically arranged, and the two rollers 68 cooperate with the two elastic members respectively; there are two cams 66 of the adjustment assembly, and the transmission block 65 is arranged between the two cams 66. The transmission block 65 and the cam 66 are fixedly connected by a positioning pin, and the two cams 66 are offset against the part of the synchronization shaft 67 located between the two rollers 68.

[0075] Further preferably, a first limiting portion 671 is protruded from the synchronization shaft 67 , and the first limiting portion 671 is located between the two cams 66 .

[0076] In this embodiment, Figures 23 to 27 As shown, a plurality of gear slots 661 are provided on the outer peripheral surface of the cam 66, and the synchronization shaft 67 is engaged with the gear slots 661 of the cam 66. By rotating the cam, the synchronization shaft 67 is engaged with different gear slots, thereby realizing the elastic force adjustment of the elastic member.

[0077] In this embodiment, Figures 23 to 27 As shown, a second limiting portion 662 is protruded from the cam 66, and the second limiting portion 662 extends from the bottom of the front end of the tailstock 3. Such an arrangement can limit the rotation range of the cam 66.

[0078] In this embodiment, Figures 23 to 27 As shown, the elastic member includes a first spring 61, a first connecting seat and a second connecting seat; the front end of the first connecting seat is protruded with a guide portion, the rear end of the guide portion is provided with a guide hole, the front end of the second connecting seat is protruded with a guide rod, the guide rod is plugged into the guide hole and slides together, the first spring 61 is sleeved on the guide portion and the guide shaft, and the two ends of the first spring 61 are respectively against the first connecting seat and the second connecting seat; the first card slot and the first avoidance slot are provided at the front end of the first connecting seat, and the second card slot is provided at the rear end of the second connecting seat.

[0079] In this embodiment, a driving rod 69 is fixed on the handle 60 , and the driving rod 69 passes through the first shaft and is fixedly connected to the first gear.

[0080] In this embodiment, Figures 16 to 22As shown, the tailstock 3 also includes a locking plate 34, which is fixed to the first connecting portion of the exterior panel 36. The locking plate 34 is located between the rear end panel 32 of the tailstock 3 and the base 2. The locking plate 34 is provided with a plurality of locking positions arranged in an up-and-down direction. The first locking tongue of the locking mechanism engages or disengages the locking positions on the locking plate 34 to lock or unlock the tailstock 3 and the base 2. In this embodiment, the locking position is a lock hole 341; in other embodiments, the locking position may also be a position slot or a position protrusion.

[0081] When the locking cam 72 is in the unlock state, the locking cam 72 is in the unlock state, and the locking cam 72 is in the unlock state, so that the locking cam 72 is locked and the locking cam 72 is locked.

[0082] In this embodiment, Figures 16 to 22 As shown, the tailstock locking mechanism also includes a first torsion spring 78, a second spring 76 and a first cable 74. The first torsion spring 78 is rotatably mounted on the base 2. The two legs of the first torsion spring 78 are respectively an operating leg and a driving leg. The operating leg of the first torsion spring 78 is connected to the lock tongue 73, and the first cable 74 drives the lock tongue 73 to move, extend or retract through the first torsion spring 78: when the lock tongue 73 is extended, the lock tongue 73 engages with the locking gear on the tailstock 3 to lock the base 2 and the tailstock 3 relatively fixed; when the lock tongue 73 is retracted, the lock tongue 73 disengages from the locking gear on the tailstock 3 to enable the tailstock 3 to rotate relative to the base 2; the second spring 76 is arranged between the cable and the driving leg of the first torsion spring 78, and the second spring 76 can give the lock tongue 73 a tendency to retract and return to its original position. With this arrangement, the tailstock locking mechanism provides the lock tongue with a flexible and continuous driving force through the torsion spring and the spring, thereby ensuring that the tailstock can be rotated without the user having to deliberately control it, and allowing the lock tongue to lock the tailstock and the base in the appropriate position.

[0083] Further preferably, the movement position of the first cable 74 includes a normally closed position and a normally open position; when the first cable 74 is in the normally open position, the second spring 76 drives the first torsion spring 78 to reset and disengage the lock tongue 73 from the tail stock 3, and the first cable 74 can drive the lock tongue 73 to be plugged into the lock hole 341 of the tail stock 3 through the first torsion spring 78; when the first cable 74 is in the normally closed position, the second spring 76 cannot drive the first torsion spring 78 to reset and disengage the lock tongue 73 from the tail stock 3.

[0084] In this embodiment, one end of the first cable 74 is the driving end, and the other end of the first cable 74 is the operating end. The driving end of the first cable 74 is connected to the support leg of the first torsion spring 78, and the operating end of the first cable 74 is connected to the operating lever hinged on the base 2. The operating lever is provided with a gear protrusion, and the base is provided with a gear slot; after the user manually shifts the operating lever to drive the gear protrusion to engage with the gear slot, the first cable 74 is restricted to the normally closed position, and the second spring 76 cannot drive the first torsion spring 78 to reset and disengage the lock tongue 73 from the tail stock 3; after the user manually shifts the operating lever to drive the gear protrusion to disengage the gear slot, the second spring 76 can drive the first torsion spring 78 to reset and disengage the lock tongue 73 from the tail stock 3.

[0085] In this embodiment, Figures 16 to 22 As shown, the locking mechanism includes a lever 72, which is mounted on the base 2 in a manner that allows it to slide back and forth. The rear end of the lever 72 is fixedly connected to the first locking tongue 73, and the rear support leg of the second spring 76 is plugged into the lever 72.

[0086] In this embodiment, the positioning plate 25 on the base 2 has a second slide groove, and the first lock tongue 73 is arranged in the second slide groove. A cover plate 26 is fixed on the top of the fixed seat, and a waist-shaped hole is opened on the cover plate 26. The rear end of the shift rod 72 is protruded with a second connecting portion 721, and the second connecting portion passes through the waist-shaped hole on the cover plate 26 and is fixedly connected to the first lock tongue 73.

[0087] When the locking cam 75 is in the unlocking state, the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam 78 is in the unlocking state, and the locking cam

[0088] In this embodiment, a first positioning groove 712 and a second positioning groove 711 are provided on the front end of the second mounting seat 71. The first positioning groove 712 is located above the second positioning groove 711 and is connected by a clamping portion. One end of the wire tube is provided in the first positioning groove 712, and the end of the wire tube is clamped and fixed to the second positioning groove 711 by the clamping portion. The lower end of the second spring 76 of the first positioning groove 712 is inserted into the first positioning groove 712 and is abutted against the clamping portion of the first positioning groove 712. One end of the first cable 74 passes through the second positioning groove 711 and the second spring 76 and is connected to the driving support leg of the first torsion spring 78.

[0089] The first and second stoppers 714 are provided with a first cam 722 which is located above the first cam 714 and a second cam 724 which is located above the first stopper 714. The first and second stoppers 714 are provided with a first cam 722 which is located above the first cam 714. The first and second stoppers 714 are provided with a first cam 722 which is located above the first cam 714. A fifth limiting portion 722 is raised on 24, and a third limiting groove 714 is provided at the rear end of the second mounting seat 71. The third limiting groove 714 is connected to the first limiting groove 715, and the fifth limiting portion 722 is located in the third limiting groove 714 and slides together; the fifth limiting portion 722 and the fourth limiting portion 716 are respectively arranged on two opposite sides of the third limiting portion 724; a fourth limiting groove 717 is provided on the second mounting seat 71, and the fourth limiting groove 717 is located below the first limiting groove 715 and is connected to each other. The bottom of the fifth limiting portion 722 protrudes from below the third limiting portion 724, and the bottom of the fifth limiting portion 722 is inserted into the fourth limiting groove 717 and slides together.

[0090] In this embodiment, two third limiting portions 724 are arranged front and back, and the two third limiting portions 724 cooperate to form a driving groove 723. The support leg of the first torsion spring 78 is inserted into the driving groove 723, and the first torsion spring 78 drives the shift rod 72 to move by pushing the end face of the third limiting portion 724.

[0091] In this embodiment, Figures 23 to 25 As shown, a control mechanism rocker 82 is also provided on the second mounting seat 71. A second cable 81 is fixedly connected to one end of the rocker 82, which drives the rocker 82 to swing. A reset member is provided between the rocker 82 and the second mounting seat 71 to reset the rocker 82. This arrangement integrates the control mechanism and the locking mechanism on the second mounting seat 71, facilitating assembly of the pallet and positioning of various components.

[0092] In this embodiment, Figure 14 As shown, the rocker rod 82 of the control mechanism and the driving rod 72 of the locking mechanism are arranged in parallel.

[0093] In this embodiment, Figure 22 As shown, a fifth positioning groove 710 is provided on the second mounting seat 71 , the rocker rod 82 is inserted into the fifth positioning groove 710 , and the reset member is provided between the rocker rod 82 and the inner wall of the fifth positioning groove 710 .

[0094] Further preferably, the rocker arm 82 is hinged to the second mounting seat 71 through a hinge shaft, the reset member is a second torsion spring, the second torsion spring is sleeved on the hinge shaft, one leg of the second torsion spring is against the rocker arm 82, and the other leg of the second torsion spring is fixedly connected to the second mounting seat 71.

[0095] Further preferably, a connecting hole 7101 is provided inside the fifth positioning groove 710 , and the end of the leg of the second torsion spring is inserted into the connecting hole 7101 .

[0096] Further preferably, a receiving slot 822 is formed on the rocker arm 82, through which the hinge shaft passes, and a second torsion spring is disposed within the receiving slot 822. One leg of the second torsion spring abuts against the inner wall of the receiving slot 822, while the other leg of the second torsion spring extends from the receiving slot 822 and engages with the connecting hole 7101. This arrangement makes the control mechanism more compact, and the torsion spring of the second leg can limit the range of motion of the rocker arm 82.

[0097] Further preferably, a third positioning groove 718 and a fourth positioning groove 719 are provided on the second mounting seat 71, the third positioning groove 718 is provided at the front end of the second mounting seat 71, the third positioning groove 718 and the fifth positioning groove 710 are connected through the fourth positioning groove 719, a second wire tube is sleeved on the second cable 81, the end of the second wire tube is inserted into the third positioning groove 718, and the second cable 81 passes through the fourth positioning groove 719 and is fixed to the front end of the rocker arm 82.

[0098] In this embodiment, Figures 17 to 20 As shown, a connecting sleeve 83 is installed on the base 2, and the gas rod 8 is installed on the base 2 through the connecting sleeve 83. The switch 80 of the gas rod 88 protrudes from the connecting sleeve 83. The rear end of the rocker arm 82 is the operating end 821, and the operating end 821 is located above the switch 80 of the gas rod 8.

[0099] In this embodiment, the connecting sleeve 83 for mounting the gas rod 88 and the positioning plate 24 for mounting the first locking tongue 73 are both arranged in the middle position of the base 2 , and the connecting sleeve 83 is located in front of the positioning plate 24 .

[0100] In this embodiment, Figures 4 to 6As shown, a seat plate 12 for mounting a chair seat is slidably mounted on the top seat 1; a sixth positioning groove 112 and a seventh positioning groove 115 are provided on the top of the top seat 1, one end of the sixth positioning groove 112 being connected to the seventh positioning groove 115, a second slidable locking tongue 13 being installed in the sixth positioning groove 112, and a second spring being provided between the second locking tongue 13 and the inner wall of the sixth positioning groove 112 for driving the end of the second locking tongue 13 into the seventh positioning groove 115; a plug-in portion 123 is provided on the seat plate 12, the plug-in portion 123 being located in the seventh positioning groove 115 and being able to slide within the seventh positioning groove 115; the second locking tongue 13, after being inserted into the seventh positioning groove 115, can be plugged into the plug-in portion 123, thereby fixing the top seat 1 and the seat plate 12. One end of a third cable 14 is fixedly connected to the second locking tongue 13, and the third cable 14 pulls the second locking tongue 13 to disengage the second locking tongue 13 from the seat plate 12, allowing the seat plate 12 and the top seat 1 to slide relative to each other.

[0101] In this embodiment, one end of the second locking tongue 13 is a locking end 131, which is provided with a slot 132. The plug-in portion 123 is provided with a plurality of second latching protrusions 124, which are pluggably connected to the slot 132. Three adjacent second latching protrusions 124 can lock the end of the second locking tongue 13. Further preferably, on the plug-in portion 123, two adjacent second latching protrusions 124 cooperate to form a slot, into which the end of the second locking tongue 13 can be inserted.

[0102] Further preferably, a second through hole 122 is further provided on the seat plate, and the plug-in portion 123 is disposed in the second through hole 122 .

[0103] In this embodiment, a third spring 16 is disposed between the top seat 1 and the base plate 12. A second escape groove 114 is provided at the top of the top seat 1, and the third spring 16 is disposed within this second escape groove 114. The ends of the third spring 16 are connected to the top seat 1 and the base plate 12, respectively. The second escape groove 114 extends through the sixth positioning groove 112. A fourth escape hole 133 is defined in the second locking tongue 13, through which the third spring 16 passes.

[0104] Further preferably, a first through hole 125 is opened on the seat plate 12 , one end of the third spring 16 is fixed to the top seat 1 through a fastener, and the other end of the third spring 16 hooks the seat plate 12 through the first through hole 125 .

[0105] In this embodiment, a mounting groove 113 is provided on the top of the top seat 1, the sixth positioning groove 112 is provided in the mounting groove 113, the pressure cover 17 is fixed in the mounting groove 113, the pressure cover 17 seals the sixth positioning groove 112 and restricts the second lock tongue 13 in the sixth positioning groove 112.

[0106] In this embodiment, a plurality of waist-shaped sliding holes 121 are provided on the seat plate 12, and a sixth limiting portion 111 is protruded on the top seat 1. The sixth limiting portion 111 extends into the waist-shaped sliding hole 121 and abuts against the side wall of the waist-shaped sliding hole 121. A cover 15 is fixed on the top of the sixth limiting portion 111, and the cover 15 presses the seat plate 12 on the top seat 1 to prevent the seat plate 12 from moving up and down.

[0107] In this embodiment, the first cable 74 and the second cable 81 extend from the front end of the base 2 , and the third cable 14 extends from the side surface of the base 2 .

[0108] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0109] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A tray comprising a base (2) for mounting support legs, a top seat (1) for mounting a chair seat, and a tail seat (3) for mounting a chair back, characterized in that: It also includes a first connecting rod (5) and a second connecting rod (4), the first connecting rod (5) is located in front of the second connecting rod (4), the bottom of the first connecting rod (5) is hinged to the base (2) through the first shaft (51), the top of the first connecting rod (5) is hinged to the top seat (1) through the second shaft (52), the bottom of the second connecting rod (4) is hinged to the base (2) through the third shaft (41), the top of the second connecting rod (4) is hinged to the top seat (1) through the fifth shaft (43), the middle position of the second connecting rod (4) is slidably matched with the rear part of the tail seat (3) through the fourth shaft (42), and the front part of the tail seat (3) is hinged to the base (2) through the first shaft (51); An elastic component for imparting an upward swinging tendency to the tailstock (3) is provided between the base (2) and the tailstock (3).

2. A pallet according to claim 1, characterized in that: The two first connecting rods (5) are symmetrically arranged on the left and right, and the two second connecting rods (4) are symmetrically arranged on the left and right and are fixedly connected via a reinforcing plate (44).

3. A pallet according to claim 1, characterized in that: A limit seat (35) is fixed on the tailstock (3), and a first slide groove (351) is provided on the limit seat (35). The first slide groove (351) is arranged to be tilted upward from front to rear. The fourth shaft (42) is installed on the second connecting rod (4), and the fourth shaft (42) passes through the first slide groove (351) and is slidably matched with the first slide groove (351).

4. A pallet according to claim 1, characterized in that: The tailstock (3) includes a front end plate (33), a rear end plate (32) and two side plates (31), wherein the front end plate (33) and the rear end plate (32) are respectively arranged at the front end and the rear end of the side plates (31), and the front end plate (33) and the rear end plate (32) are fixedly connected to the side plates (31); a limit plate (24) is fixed on the base (2), and the limit plate (24) is located at the rear side of the front end plate (33); The elastic component is arranged between the front end plate (33) and the limiting plate (24).

5. A pallet according to claim 4, characterized in that: The elastic component comprises a first spring (61), and two ends of the first spring (61) act on the front end plate (33) and the limiting plate (24) respectively.

6. A pallet according to claim 5, characterized in that: The two groups of elastic members are symmetrically arranged between the front end plate (33) and the limiting plate (24).

7. A pallet according to claim 6, characterized in that: The elastic component further includes a synchronization shaft (67), on which two rollers (68) are rotatably mounted; the front end of the first spring (61) abuts against the synchronization shaft (67), so that the rollers (68) abut against the front end plate (33).

8. A pallet according to claim 7, characterized in that: The cam (66) is rotatably mounted on the front end plate (33). A plurality of gear slots (661) are provided on the outer peripheral surface of the cam (66), and the synchronization shaft (67) is engaged with the gear slots (661).

9. The pallet according to claim 1, characterized in that: A first locking tongue (73) is slidably mounted on the base, one end of the first locking tongue (73) can extend from the base (2), and the first locking tongue (73) is pluggably connected to a locking hole (341) on the tailstock (3).

10. A chair, characterized in that: A pallet comprising any one of claims 1 to 9.

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